Storage from official US gauges (USGS, USACE, Bureau of Reclamation, CDEC). Fill % uses design capacity from the National Inventory of Dams where available; a few sites without a match fall back to the 5-year maximum.

About reservoirs in Arizona

As of October 9, 2026, the reservoirs we track across Arizona that report live levels hold roughly 4,070 hm³ of water — about 61.1% of their combined capacity. Taken together, Arizona's reservoirs are within their normal operating range.

Across the region, 2 reservoirs are at critically low levels and 2 are low. Lake Mohave is the fullest at 101.0%, while San Carlos Reservoir is the lowest at 4.3%.

Over the most recent week on record, 1 reservoir rose and 1 reservoir fell across Arizona.

Storage figures for Arizona come from USGS · USACE · BOR · CDEC; the most recent reading is from October 9, 2026. Each reservoir below links to its own page with full history and seasonal context.

Arizona at a glance

Reservoirs tracked: 10
Average fill: 61.1%
Water stored: 4,070 hm³
Combined capacity: 6,660 hm³
At critically low levels: 2
Fullest: Lake Mohave (101.0%)
Lowest: San Carlos Reservoir (4.3%)
Last updated: October 9, 2026

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